Hello
I've got a problem with collection descriptors and interfaces. My class hierarchy is something like this :
<class-descriptor class="package.interfaces.InterfaceEntity">
<extent-class class-ref="package.interfaces.InterfacePlace" />
<extent-class class-ref="package.InterfaceObject" />
<extent-class class-ref="package.InterfaceCharacter" />
<extent-class class-ref="package.Area" />
</class-descriptor><class-descriptor class="package.interfaces.InterfacePlace">
...
</class-descriptor>...
All classes extending (directly or not) InterfaceEntity have a field which represents the member who has added
it to the database.
...
<field-descriptor
name="memberId"
column="member"
jdbc-type="BIGINT"
/>...
And I have a Class named 'Member' which represents a member. The problem occurs when I want to know what are the
InterfaceEntity objects created by a member. Such a collection-descriptor doesn't work :
<collection-descriptor name="additions" proxy="true" element-class-ref="package.interfaces.InterfaceEntity">
<inverse-foreignkey field-ref="memberId" />
</collection-descriptor>
StackTrace at the end of this mail.
---
I've searched for other solutions, and here is what I've tested
a) replacing the element-class-ref in the descriptor with a class which is not an Interface (such as package.Area), it works.
--> drawback : I'll have to declare one collection-descriptor for each class implementing InterfaceEntity :(
b) coding somethink like this
Criteria c = new Criteria();
c.addEqualTo("memberId", new Long(4));
QueryByCriteria q = new QueryByCriteria(InterfaceEntity.class, c);the results of the query are perfectly right.
---
More strange, in another class I have a reference descriptor like this, which work also perfectly :
<reference-descriptor
name="entity"
class-ref="package.interfaces.InterfaceEntite"
proxy="true"
>
<foreignkey field-ref="entityId" />
</reference-descriptor> I'd like to know where I've been wrong in my repository.xml. Solution (b) is quite good, but I think the cleaniest way
is to declare this collection in the repository. Any help is welcome :)
Thomas
PS :
*********** Test.java ***********
InterfaceMember m = Member.getInstance(4);
log("name : " + m.getName());
log("nb add : " + m.getAdditions().size());
*********** STACK TRACE ***********
GRAVE: Method invoking failed for method *getName* on object null
org.apache.ojb.broker.PersistenceBrokerException: org.apache.ojb.broker.OJBRuntimeException: Incorrect field reference "memberId" in [EMAIL PROTECTED] delete=false,cascade retrieve=true,cascade store=false,is lazy=false,class of Items=interface package.interfaces.InterfaceEntity]
at org.apache.ojb.broker.accesslayer.IndirectionHandler.materializeSubject(Unknown Source)
at org.apache.ojb.broker.accesslayer.IndirectionHandler.getRealSubject(Unknown Source)
at org.apache.ojb.broker.accesslayer.IndirectionHandler.invoke(Unknown Source)
at $Proxy0.getName(Unknown Source)
at package.Test.main(Test.java:26)
Caused by: org.apache.ojb.broker.OJBRuntimeException: Incorrect field reference "memberId" in [EMAIL PROTECTED] delete=false,cascade retrieve=true,cascade store=false,is lazy=false,class of Items=interface package.interfaces.InterfaceEntity]
at org.apache.ojb.broker.metadata.ObjectReferenceDescriptor.getForeignKeyFieldDescriptors(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getFKQuery1toN(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getFKQuery(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollection(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollections(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown Source)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source)
... 5 more
org.apache.ojb.broker.PersistenceBrokerException: Error invoking:getName
at org.apache.ojb.broker.accesslayer.IndirectionHandler.invoke(Unknown Source)
at $Proxy0.getName(Unknown Source)
at package.Test.main(Test.java:26)
Caused by: org.apache.ojb.broker.PersistenceBrokerException: org.apache.ojb.broker.OJBRuntimeException: Incorrect field reference "memberId" in [EMAIL PROTECTED] delete=false,cascade retrieve=true,cascade store=false,is lazy=false,class of Items=interface package.interfaces.InterfaceEntity]
at org.apache.ojb.broker.accesslayer.IndirectionHandler.materializeSubject(Unknown Source)
at org.apache.ojb.broker.accesslayer.IndirectionHandler.getRealSubject(Unknown Source)
... 3 more
Caused by: org.apache.ojb.broker.OJBRuntimeException: Incorrect field reference "memberId" in [EMAIL PROTECTED] delete=false,cascade retrieve=true,cascade store=false,is lazy=false,class of Items=interface package.interfaces.InterfaceEntity]
at org.apache.ojb.broker.metadata.ObjectReferenceDescriptor.getForeignKeyFieldDescriptors(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getFKQuery1toN(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getFKQuery(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollection(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollections(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getDBObject(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByIdentity(Unknown Source)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByIdentity(Unknown Source)
... 5 more
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